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Implement Copy and ToTokens for Nothing #1597

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merged 2 commits into from
Mar 16, 2024
Merged

Implement Copy and ToTokens for Nothing #1597

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3f37543
Implement Copy for syn::parse::Nothing
dtolnay Mar 16, 2024
4f6c052
Implement ToTokens for syn::parse::Nothing
dtolnay Mar 16, 2024
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22 changes: 22 additions & 0 deletions src/parse.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,8 @@ use crate::lookahead;
use crate::punctuated::Punctuated;
use crate::token::Token;
use proc_macro2::{Delimiter, Group, Literal, Punct, Span, TokenStream, TokenTree};
#[cfg(feature = "printing")]
use quote::ToTokens;
use std::cell::Cell;
use std::fmt::{self, Debug, Display};
#[cfg(feature = "extra-traits")]
Expand Down Expand Up @@ -1354,6 +1356,26 @@ impl Parse for Nothing {
}
}

#[cfg(feature = "printing")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
impl ToTokens for Nothing {
fn to_tokens(&self, tokens: &mut TokenStream) {
let _ = tokens;
}
}

#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl Clone for Nothing {
fn clone(&self) -> Self {
*self
}
}

#[cfg(feature = "clone-impls")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
impl Copy for Nothing {}

#[cfg(feature = "extra-traits")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
impl Debug for Nothing {
Expand Down